NFS: Fix race in nfs_set_page_dirty

Protect nfs_set_page_dirty() against races with nfs_inode_add_request.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index ce5b4a9..7975589 100644 (file)
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -388,6 +388,8 @@ static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
        }
        SetPagePrivate(req->wb_page);
        set_page_private(req->wb_page, (unsigned long)req);
+       if (PageDirty(req->wb_page))
+               set_bit(PG_NEED_FLUSH, &req->wb_flags);
        nfsi->npages++;
        atomic_inc(&req->wb_count);
        return 0;
@@ -407,6 +409,8 @@ static void nfs_inode_remove_request(struct nfs_page *req)
        set_page_private(req->wb_page, 0);
        ClearPagePrivate(req->wb_page);
        radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index);
+       if (test_and_clear_bit(PG_NEED_FLUSH, &req->wb_flags))
+               __set_page_dirty_nobuffers(req->wb_page);
        nfsi->npages--;
        if (!nfsi->npages) {
                spin_unlock(&nfsi->req_lock);
@@ -1527,15 +1531,22 @@ int nfs_wb_page(struct inode *inode, struct page* page)
 
 int nfs_set_page_dirty(struct page *page)
 {
+       spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock;
        struct nfs_page *req;
+       int ret;
 
-       req = nfs_page_find_request(page);
+       spin_lock(req_lock);
+       req = nfs_page_find_request_locked(page);
        if (req != NULL) {
                /* Mark any existing write requests for flushing */
-               set_bit(PG_NEED_FLUSH, &req->wb_flags);
+               ret = !test_and_set_bit(PG_NEED_FLUSH, &req->wb_flags);
+               spin_unlock(req_lock);
                nfs_release_request(req);
+               return ret;
        }
-       return __set_page_dirty_nobuffers(page);
+       ret = __set_page_dirty_nobuffers(page);
+       spin_unlock(req_lock);
+       return ret;
 }